St. Thomas Assembly was an automobile plant located in Southwold, Ontario, Canada close to the Talbotville community and to the nearby city of St. Thomas. The 2,600,000 sq ft (240,000 m2) facility, encompassing 635 acres (2.57 km2),[1] opened in 1967, building the Ford Falcon.[2] Flexible fuel vehicles (FFV) capable of operating on ethanol fuel were manufactured there during the later years of the assembly plant.[2] Ford's plans for sustainability and reduction of fossil fuel consumption relied on the St. Thomas Plant and its Lincoln Town Car vehicles for years.[1] It also produced the final Mercury vehicle, a Mercury Grand Marquis, after Ford decided to discontinue the Mercury brand after the 2011 model year.

The plant closed September 15, 2011. The last Crown Victoria built by the remaining 300 employees was sent to Saudi Arabia.[3]

The plant had been largely demolished by the end of 2016, with only the wastewater treatment facility left standing as of Feb. 2017.[4]

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In total, over 8 million vehicles were produced by St. Thomas Assembly from 1967 to 2011.[5] Alongside the vehicles of the Ford Panther platform, St. Thomas also produced the Ford Falcon, Ford Maverick, Ford Pinto (Mercury Bobcat), Ford Fairmont (Mercury Zephyr), and Ford Escort EXP (Mercury LN7).